Ultrasonication-assisted synthesis of CsPbBr₃ and Cs₄PbBr₆ perovskite nanocrystals and their reversible transformation

• Longshi Rao,
• Xinrui Ding,
• Xuewei Du,
• Guanwei Liang,
• Yong Tang,
• Kairui Tang and
• Jin Z. Zhang

Beilstein J. Nanotechnol. 2019, 10, 666–676, doi:10.3762/bjnano.10.66

• water. The mechanism of this transformation between the CsPbBr3 PNCs and Cs4PbBr6 PNCs and their morphology change are studied, involving ions equilibrium, anisotropic growth kinetics, and CsBr-stripping process. Keywords: CsPbBr3 PNCs; Cs4PbBr6 PNCs; polar-solvent-free; reversible transformation

• attempts have been made to synthesize PNCs without the use of polar solvents. Tong’s group demonstrated the single-step and polar-solvent-free synthesis of CsPbX3 PNCs with tunable halide ion composition and thickness through the direct ultrasonication of precursors [29]. Whereas this method has been

• reported for synthesizing PNCs without using polar solvents, it does not allow for a control over dimensionality and phase transformation. We recently reported a fast, low-cost, environmentally friendly, and polar-solvent-free strategy for synthesizing all-inorganic CsPbBr3 NCs with tunable shape and size